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1 | /*============================================================================= |
2 | Copyright (c) 2009 Hartmut Kaiser | |
3 | ||
4 | Distributed under the Boost Software License, Version 1.0. (See accompanying | |
5 | file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt) | |
6 | ==============================================================================*/ | |
7 | ||
8 | #if !defined(BOOST_FUSION_NVIEW_VALUE_AT_IMPL_SEP_24_2009_0234PM) | |
9 | #define BOOST_FUSION_NVIEW_VALUE_AT_IMPL_SEP_24_2009_0234PM | |
10 | ||
11 | #include <boost/fusion/support/config.hpp> | |
12 | #include <boost/fusion/sequence/intrinsic/value_at.hpp> | |
13 | ||
14 | namespace boost { namespace fusion | |
15 | { | |
16 | struct nview_tag; | |
17 | ||
18 | namespace extension | |
19 | { | |
20 | template<typename Tag> | |
21 | struct value_at_impl; | |
22 | ||
23 | template<> | |
24 | struct value_at_impl<nview_tag> | |
25 | { | |
26 | template<typename Sequence, typename N> | |
27 | struct apply | |
28 | { | |
29 | typedef typename Sequence::sequence_type sequence_type; | |
30 | typedef typename Sequence::index_type index_type; | |
31 | ||
32 | typedef typename result_of::at<index_type, N>::type index; | |
33 | typedef typename result_of::at<sequence_type, index>::type type; | |
34 | }; | |
35 | }; | |
36 | } | |
37 | ||
38 | }} | |
39 | ||
40 | #endif |